7-88 An insulated piston-cylinder device initially contains 300 L of air at 120 kPa and 17°C. Air is now heated for 15 min by a 200-W resistance heater placed inside the cylin- der. The pressure of air is maintained constant during this process. Determine the entropy change of air, assuming (a) constant specific heats and (b) variable specific heats.

Q: 7-93 Air is compressed in a piston-cylinder device from 100 kPa and 17°C to 800 kPa in a reversible,…

A: Here we will use the basic relationship between temperature and pressure for adiabatic process and…

Q: A piston-cylinder device contains 0.66 kg of nitrogen gas at 140 kPa and 37°C. The gas is now…

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Q: 7-107 A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the…

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Q: A 0.5-m3 rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is…

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Q: A piston-cylinder device contains 0.13 kg of air initially at 2 MPa and 350°C. The air is first…

A: Introduction In this problem, we will calculate the work done by the piston cylinder device or work…

Q: An insulated rigid tank of 0. 3 m3 is to be filled with steam by connecting it to a high-pressure…

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Q: 2-kg of air (as an ideal gas) is compressed in an adiabatic compressor from an initial state of 100…

A: Given Data State 1: 100 kPa, 300 K State 2: 200 kPa, 600 K m=2 kg

Q: A 100-lbm block of a solid material whose specific heat is 0.5 Btu/lbm·R is at 80°F. It is heated…

A: Write the given data: mb=100 lbmcb=0.5 Btu/lbm-°RT1=80 °F=80+460 (°R)=540 °RmW=10 lbmPW=20 psia

Q: 5-83 Refrigerant-134a at 700 kPa, 70°C, and 8 kg/min is cooled by water in a condenser until it…

A: Given Data The pressure of the refrigerant is: P=700 kPa The temperature of refrigerant is: T=70°C…

Q: The air in an insulated, rigid compressed-air tank whose volume is 0.5 m3 is initially at 2400 kPa…

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Q: Please do not use the answers to calculate the answer, Find the answer the normal way.

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Q: A rigid tank is divided into two equal parts by a partition. One part of the tank contains 1.5 kg of…

A: Here we will refer to the steam table to get the values of specific volume and entropy at the…

Q: A piston–cylinder device contains 5 kg of saturated water vapor at 3 MPa. Now heat is rejected from…

A: Given Data: The mass of the saturated water vapor is M= 5 kg. The pressure is P = 3 MPa. The…

Q: A rigid tank is divided into two equal parts by a partition. One part of the tank contains 2.5 kg of…

A: To find: The entropy change of water during the process. Given  The mass of compressed liquid m=2.5…

Q: heating system has a volume of 20 Land is filled with superheated water vapor at 200 kPa and 150°C.…

A: Volume of water = 20 LWater vapour pressure P1 = 200kPaWater vapour temperature T1 = 150o CSteam…

Q: Nitrogen gas is compressed from 80 kPa and 27°C to 480 kPa by a 17-kW compressor. Determine the mass…

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Q: An ideal free piston-cylinder with an initial volume of 0.5500 m³ contains 19.00 kg of refrigerant…

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Q: Ten grams of computer chips with a specific heat of 0.3 kJ/kg·K are initially at 20°C. These chips…

A: Entropy is defined as the degree of randomness of a molecule and the entropy change of the…

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.